Discussion
Which of the following is an IEEE standard for frame tagging?
Answer: C
Correct answer: 802.1Q
802.1Q is the IEEE standard, and it tags a frame by inserting a four-byte field into the existing header, which is why the native VLAN can travel untagged. ISL is Cisco’s proprietary alternative and encapsulates the entire frame rather than tagging it. 802.3z and 802.3u are Gigabit and Fast Ethernet, unrelated to VLANs.
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